File:Travertine speleothem 1.jpg
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Summary
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| Description |
English: The general term for all secondary mineral deposits occurring in caves is speleothem (a.k.a. "cave formations"). Two to three hundred different minerals have been reported to occur in various types of speleothem around the world. The most common speleothem minerals are calcite (CaCO3), aragonite (CaCO3), and gypsum (CaSO4·2H2O). Calcareous speleothem is given the rock name "travertine".
Varieties of cave travertine are named based on morphology and origin. Common varieties include flowstone, knobstone (a.k.a. coralloids), helictites, shelfstone, rimstone, cave pearls, frostwork, etc. This is a broken cross-section through a piece of travertine speleothem, but I'm not sure what it is - it could be an oddly-shaped drapery. Draperies are a type of dripstone, which forms by precipitation of minerals from dripping water. Unlike stalactites and stalagmites, which form by the action of free-falling water drops, draperies form as drops descend along inclined cave ceilings and walls. Draperies look like wrinkled curtains. Bands of impurities make some draperies look like bacon ("cave bacon"). Locality: unknown (donated specimen) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50700617098/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50700617098. It was reviewed on 11 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:09, 11 December 2020 | | 3,910 × 2,141 (4.81 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50700617098/ with UploadWizard |
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